in PXD lore, all the students/class was fighting up against another classmate (naoki) on a field. Noah knew he wouldn’t make it out alive at the end since there was a certain plant that demons were allergic to everywhere on the field. So Noah sacrificed himself and just picked some of the plant, rubbing it on his skin. His body almost immediately had an allergic reaction and he started to fade away. He said his last goodbyes to everyone, all while crying. Though no one really payed any attention to him, he still cared about everyone. Especially kamata. He had loved her for such a long time, and she had some feelings in return for him. Her and rezume were both in shock as he slowly faded away. He just accepted his fate and died peacefully.